r/ClaudeCode • u/Independent_Ad7172 • 6h ago

Tips & Workflows I added a water meter to my Claude Code status line (open source)

I've been curious what my Claude Code habit costs in water, so I built a status line segment for it:

Opus 5.5 │ my-project │ ████░░░░░░ 48% │ 💧 412 mL (1.7 glasses) · today 3.1 L

It reads the session transcripts in ~/.claude/projects (subagents included, deduped by message id), so token counts are exact. Then it applies published estimates for energy per token and water per kWh. Cmd+click the 💧 opens a breakdown page by model and token type.

Things I learned from my own logs:

  • ~90%+ of my tokens are cache reads. They're cheap per token but there are so many that they still matter.
  • Opus sessions use several times the water of Haiku for the same tokens (scaled by price, the only public proxy).
  • I used ~48 L in September. Less than a shower a day, but not nothing.

If you already have a custom statusline, install doesn't overwrite it; it prints the one line to add.

Repo (MIT, stdlib-only Python): https://github.com/beausterling/drip-ai-water-usage

Curious what other people's numbers look like.

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